-- Owner notices (issue #171): one row per episode, remembered only as "the
-- owner was told". The row's presence is the whole state — the poller checks
-- it before sending, writes it after a successful send, and clears it when
-- the condition no longer holds. site is '' for a fault that is not one
-- Site's; the composite primary key is what makes the row a lock against a
-- second message for the same episode.
CREATE TABLE owner_notices (
	condition text NOT NULL,
	site text NOT NULL,
	notified_at bigint NOT NULL,
	PRIMARY KEY (condition, site)
);